Maybe something for the CompareUtils class proposed in LANG-483:
http://issues.apache.org/jira/browse/LANG-483
I'd prefer compareNullFirst, compareNullLast instead of the boolean param.
Hen
On Mon, Aug 10, 2009 at 5:23 AM, Antony Riley<ant...@cyberiantiger.org> wrote:
> Maybe I'm missing something obvious but commons lang does not seem to
> provide a null safe compare method for comparable objects.
>
> My apologies if this functionality exists somewhere in commons lang and I'm
> being brain dead with regards to locating it.
>
> It seems like a really obvious addition, code would probably look like
>
> // In ObjectUtils.
>
> /**
> * Compare two Comparable objects for order.
> *
> * This method is null safe. Null is considered to be less than all other
> objects.
> *
> * @param a the first object to be compared.
> * @param b the second object to be compared.
> * @return a negative integer, zero, or a positive integer as the first
> argument is less than, equal to, or greater than the second.
> */
> public int compare(Comparable a, Comparable b) {
> return compare(a,b,true);
> }
>
> /**
> * Compare two Comparable objects for order.
> *
> * This method is null safe. Null is considered to be less than all other
> objects if nullfirst is true, else
> * it is considered to be greater than all other objects.
> *
> * @param a the first object to be compared.
> * @param b the second object to be compared.
> * @param nullfirst
> * @return a negative integer, zero, or a positive integer as the first
> argument is less than, equal to, or greater than the second.
> */
> public int compare(Comparable a, Comparable b, boolean nullfirst) {
> // Deal with the case both a, b are null or they are both equal first.
> if (a == b) {
> return 0;
> } else if (a == null) {
> return nullfirst ? -1 : 1;
> } else if (b == null) {
> return nullfirst ? 1 : -1;
> } else {
> return a.compareTo(b);
> }
> }
>
> -Antony
>
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